Improvement in sewing-machine casters



1. K; PROBTOB.

Sewing-lllzuzhine Casters.

N0. 145,011. Patented Nov.25,1873.

FIG. 7. F/CEZ.

WIITNESS Esv 4 vnvrwr. QM 03 I 1 a UNITED STATES PATENT Orrron.

JAMES K. PROOTOR, OF MALDEN, MASSACHUSETTS.

IMPROVEMENT IN SEWING-MACHINE CASTERS.

Specification forming part of Letters Patent No 145,01 1, dated November25, 1873; applicaticnfiled November 1, 1873.

To all whom it may concern:

p Be it known that I, Janus K. PROCTOR, of Malden, in the State ofMassachusetts, have invented an Improved Caster Attachment forSewingMachine Tables or Stands, of which the following is aspecification:

This invention consists of a rectangular frame carrying at each corner acaster-wheel or roller, and located horizontally within and between thetwo end standards of the table or stand, it being hung to the standardsand connecting-rod in such manner as to secure, un-

the table or stand is shown at rest on the casters.

A in the drawings represents a sewing-machine stand, whieh, asordinarily, is composed of a table, B, and end standards or frames 0 C;a a, two similar bars. These bars a a carry caster-wheels b. Thecaster-wheels b are located one at each end of each bar a, and they areof ordinary construction, and are swiveled to the bars a; d, a rod. Thisrod connects together the two bars a a, and the connection is made bysimilar arms ff, which are fixed to the rod, but pivoted to the bars aa.

When the bars a a and rod are connected, as above described, the bars aa. are parallel with each other, and, together with the rod,

produce the caster-frame D, which is substantially rectangular in shape,and of such length and width as, when located within and between the endstandards 0 O of the sewingmachine table A, to bring a caster-wheel ator near each corner or leg E of the said standards G, as shown in Fig.3.

In this location of the caster-frame D, the bars a a and rod (1 areunder the rod F, to which ordinarily are hung the treadle-fcet of thesewnlg-machine; and in this position of frame D each bar a at the sameend 9 is connected to the table-standards, the-one bar by a link orcrank-arm, h, and the other by an angular slot, 2', and pin is, and,besides this, the arms f of the common rod (1, joining the bars a, havea bearing, as at 1, against and about the treadle-rod F; G, atreadle-lever for operating the caster attachment. This treadlelever Gis pivoted to one of the rod-arms f, so that when depressed it will abutagainst the pin m of such arm, and it is adapted at n to hook under thenearer caster-bar a, as shown in Fig. 4.

In an arrangement, construction, and application of parts such as abovedescribed, the casters are in a'common horizontal plane or position, andunder a movement of the casterframe upon its hangings of themachine-standards O and treadle-rod F, while the horizontal plane orposition of the casters is changed; their then horizontal position isparallel, or practically so, to that previously occupied by them.

If desired to set and hold the machine at rest on the casters, depressthe treadle-lever Gr and hook it under the nearer caster-bar a, asstated; but if desired to set the machine at rest on its ordinary legs,disengage the treadlelever G, and the weight of the machine is free tobring the machine down.

The movement of the machine-standards and. of the caster-framerelatively to each other, as before stated, is in parallel horizontalplanes, and this is effected by the described link or crank-armconnections between the bars a and the treadle-rod F, and between thesame bars a and the standards 0, the angular slot 2' and pin 7cconnection of the one bar a being substantially equivalent to theswinging link or crank-arm connection of the other caster-bar a.

p, hooks to the caster-bars, one to each bar. These hooks hold the barsfrom dropping away from the treadle-rod F, but have no connection'whatever in the operation of the attachment.

The construction and arrangement of the caster-frame herein describedare simple and easy of application, and when operated the movement issteady, firm, and posith e, and a caster-support is obtained at the fourlegs of the table.

Having thus described my invention, What I claim, and desire to secureby Letters lat cut, is

The caster-frame D, herein described, the same consisting of the twobars a, each carrying two caster-Wheels, b, and the connecting rod (1,which bars 66, together with the rods (1, are hung to the standards 0and connectingsigned by me this 17 th day of September, A. l). 1873.

JAMES K. PROOTOP.

Vitnesses:

V G. K. Pnoeron,

EDWIN W. BROWN.

